diff --git a/ruff.toml b/ruff.toml
index 70612985..06942bd4 100644
--- a/ruff.toml
+++ b/ruff.toml
@@ -1,3 +1,6 @@
+# keep in sync with `options.requires-python` in `setup.cfg`
+target-version = "py38"
+
 [lint]
 extend-select = [
 	"C901",
diff --git a/setup.cfg b/setup.cfg
index f46b6cbf..0baf817c 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -14,6 +14,7 @@ classifiers =
 
 [options]
 include_package_data = true
+# keep in sync with `target-version` in `ruff.toml`
 python_requires = >=3.8
 install_requires =